grep: add MULTIREV support to --allfiles flag This patch facilitates passing multiple revisions with all-files flag. It's assumed that if you are passing multiple revisions to --allfiles, you want hits from all of them. Differential Revision: https://phab.mercurial-scm.org/D3976

phabricator: convert description into local The description from conduit is a unicode. Differential Revision: https://phab.mercurial-scm.org/D3980

index: move index_clearcaches() further down I want to add a call from it to a new function (nt_dealloc) that will be inserted below its current position. Differential Revision: https://phab.mercurial-scm.org/D4117

index: move all "nt_*" functions to one place Differential Revision: https://phab.mercurial-scm.org/D4116

index: rename "nt_*(indexObject *self,...)" functions to "index_*" These functions do something with the nodetree, but they're less generic and won't make sense as methods on the nodetree when it becomes a Python type. Differential Revision: https://phab.mercurial-scm.org/D4115

index: split up nt_init() in two I'd like to make nt_init() take a pointer to a nodetree to initialize, but it currently also allocates the nodetree. This patch prepares for that change by making nt_init() be about initializing an existing node tree and by creating a new index_init_nt() that creates the nodetree. Differential Revision: https://phab.mercurial-scm.org/D4114

index: make most "nt_*" functions take a nodetree Now that the nodetree has a pointer to the index, we can pass the nodtree instead of the index. There are few "nt_*" functions left after this. I'll deal with them soon. Differential Revision: https://phab.mercurial-scm.org/D4113